I didn't realize they were that small! Sounds like they're better than MadBull's since you didn't find air bubbles; the MadBull's are full of them. I may give the King Arms a try next time I buuy some ammo.I have been using .36 & .40 King Arms bb's for a couple of years now.
Im happy with them.
I cracked a handful of them to look for airbubbles & inperfections... none found.
And if you choose to wash them the colour they come in is uniform.
Only thing i'd like better with them is that they are 5.94mm +/- .01 I'd like them to be 5.98 +/- .01
But thats no biggie.